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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c522f36bbfbc38f3ee20d8aba2fa3af880f3b823b5a45a2634fce9ca868864b3' 
  AND token = 'nDDebZPXT3w1LCKofuX5P/+iMlWlOSk6qa8kp8EGQvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}